Rains Rolltop Rucksack Mini W3 Backpack – On Sale Now with 。Rains Rolltop Rucksack Mini Navy is a smaller version of the classic, Rolltop Rucksack. This bag design is Rains’ take on a cycling backpack, featuring details traditionally used by the cycling community. Made from Rains’ signature waterproof fabric, this functional backpack has a roll-top closure with an adjustable strap that is designed with a bike lock loop. Rolltop Mini has a one main compartment and is completed with a padded backside, adjustable shoulder straps and original Rains hardware.